Schematic of system
(Click figure to enlarge)
Three-string torsional pendulum
Features
Optical rail for simple adjustments
High accuracy
Affordable
Introduction
The moment of inertia is a fundamental physical quantity representing the resistance of a rigid body to rotational motion. It depends on both the mass distribution of the object and the position of the axis of rotation.
The LEMI-18 Rotational Moment of Inertia Apparatus employs the innovative three-string pendulum method to determine the moment of inertia of rigid bodies. The system features a photoelectric sensor paired with a precision timing device to measure the torsional oscillation period of a suspended plate. This apparatus offers a hands-on approach for students to explore the principles of rotational dynamics and gain practical experience with the factors influencing the moment of inertia.
1. Measure the moment of inertia of rigid bodies using the three-string pendulum method.
2. Compare the moments of inertia for two objects of identical mass but different mass distributions.
3. Verify the parallel axis theorem for the moment of inertia.
Through these experiments, users will: understand the theoretical principles behind the moment of inertia, learn advanced measurement techniques and analyze the relationship between mass distribution, axis position, and rotational resistance, and develop a deeper understanding of the applications of the parallel axis theorem.
The included instruction manual provides clear experimental configurations and setup instructions, in-depth explanations of the underlying physical principles, step-by-step procedures for conducting experiments, and example results for guidance and validation.
Please click Experiment Theory and Contents to find more information about this apparatus. The LEMI-18 Rotational Moment of Inertia Apparatus is an essential tool for physics and engineering laboratories, combining precision, versatility, and educational value for an enriched learning experience in rotational mechanics.
Specifications
| Description | Specifications |
| String Length of the Pendulum | > 500 mm |
| Timing Resolution | 1 ms |
| Preset Count Number | < 66 |
| Specimen | small cylinder (2), circular disc (1), circular ring (1) |
Part List
| Description | Qty |
| Main Unit | incl base, slider, hanging arm, hanging disc, starting disc, pendulum strings |
| Laser Diode | 1 |
| Receiver | 1 |
| Counting Timer | 1 |
| Connection Wire | 2 |
| Circular Lever | 1 |
| Cylindrical Specimen | 2 |
| Disc Specimen | 1 |
| Ring Specimen | 1 |
| Manual | 1 |
Schematic of system
(Click figure to enlarge)
Three-string torsional pendulum
